Robusta is a variety of the species of coffee tree, Coffea canephora (Coffea canephora var. Robusta). It is noted for its ability to grow in more harsh climates and for being more resistant to disease. The coffee beans harvested from a robusta tree are generally considered less flavorful and aromatic than beans from most varieties of Coffea arabica. Most robusta beans are used in lower-grade, commercial coffees, such as instant coffee. However, many espresso blends also include at least some robusta beans.